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Perma-Joists

Perma-Joists

Perma-Joists

(OP)
A fellow engineer is looking for information on a steel joist called perma-joist(on the drawings). The date of the building is the 1950's and they are used in the roof structure of a school building. I am assuming that this may be just a manufacture's name for a steel joist. Does any one have any information on perma-joists?

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